I recommend checking this out further. Rain that falls at the top/behind the wall will travel horizontally- and potentially out the seams of the MSC. If there is a liner on the back of the wall- good, not perfect protection. If the soil behind the wall is lots of stone and gravel- good. Water will travel to the bottom of the stone/gravel before going much horizontal. 
But, in chicago, its soil. Humidity saturates the soil and then travels through the wall to be Free(!) This humidity will push off/through not permeable pigments and primers.
J

Sent from my iPhone

On Jan 5, 2018, at 12:13 PM, Lange, Christopher <clange@ci.charlotte.nc.us> wrote:

Thanks Jon. These aren’t murals per se but large painted MSE walls for light rail with colors and form liners chosen by the artist. Some type of fill/stone is surely behind them.

 

Chris Lange

Art-in-Transit Program Administrator

Charlotte Area Transit System (CATS)

600 East Fourth Street Charlotte, NC 28202

P. 704-432-2391 / ridetransit.org

 

From: public_art_network@americansforthearts.simplelists.com [mailto:public_art_network@americansforthearts.simplelists.com] On Behalf Of Pontious, Susan (ART)
Sent: Thursday, January 04, 2018 12:50 PM
To: public_art_network@americansforthearts.simplelists.com
Subject: RE: Anti-graffiti coatings on painted retaining walls

 

Dearest HWWODOCPAG,

Oh, venerable one, please don’t tantalize us with your knowledge; what are the techniques you have used to reduce/eliminate graffiti on murals?  I agree that coatings are not the necessarily the solution. 

 

Susan Pontious

Program Director

Civic Art Collection and Public Art Program

San Francisco Arts Commission

401 Van Ness, Suite 325

San Francisco, CA 94102

Phone:  415-252-2241

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PLEASE NOTE:  We moved our offices Oct. 9, 2015 to

401 Van Ness, Suite 325

San Francisco, CA 94102

 

NEW PHONE Number:  As of Oct. 9th, my new phone number is:

(415) 252-2241

NOTICE: Please be mindful that all correspondence and documents submitted to the San Francisco Arts Commission are public records and as such, are subject to the Sunshine Ordinance and can be requested by the public. If this happens, all sensitive personal information, such as social security numbers and phone numbers will be redacted.

 

From: public_art_network@americansforthearts.simplelists.com [mailto:public_art_network@americansforthearts.simplelists.com] On Behalf Of Jon Pounds
Sent: Thursday, January 04, 2018 7:37 AM
To: public_art_network@americansforthearts.simplelists.com
Subject: Re: Anti-graffiti coatings on painted retaining walls

 

Do the retaining walls have soil/rainwater behind them? Chicago experience is that you want/need a breathable primer in those cases. i.e. gesso breathes much better than polys or epoxies.

There are other techniques (developed over years of conscious attention) that  have been very effective in reducing/eliminating graf on murals (at least in Chicago). Many of our murals don't even have coatings on top of the color - the fewer the layers of paint applied, the better the wall will breathe.

Jon Pounds - HWWODOCPAG

 He Who Was Once Director Of Chicago Public Art Group

 

On 1/4/18 7:58 AM, Lange, Christopher wrote:

Hello PAN ListServ,

 

We are looking for recommendations of anti-graffiti coatings on painted retaining walls that use a two part Sherwin Williams system of Macropoxy 646 (primer) and Acrolon 218 Polyurethane. If any of you have any products you’ve had success with in the past in this type of application that doesn’t affect the finished wall color, please share.

 

Thank you,

 

Chris Lange

Art-in-Transit Program Administrator

Charlotte Area Transit System (CATS)

600 East Fourth Street Charlotte, NC 28202

P. 704-432-2391 / ridetransit.org

 

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